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Carbon Nanotube/Nitrogen-Doped Reduced Graphene Oxide Nanocomposites and Their Application in Supercapacitors

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Electrodes of carbon-based nanocomposites with high specific surface areas and suitable pore sizes have high potential for improving power and energy densities of supercapacitors. In this study, nitrogen-doped reduced graphene oxide (NrGO) nanosheets were synthesized to increase the specific surface area of reduced graphene oxide (rGO). The specific surface area of NrGO was increased to 633 m2g-1 compared to that of rGO, 450 m2g-1. A series of NrGO/carbon nanotubes (CNTs) nanocomposites were prepared. By using NrGO/CNTs/polyvinylidene difluoride (PVDF)/carbon black/N-methyl-pyrrolidone (NMP) nanocomposites as both of anode and cathode into two electrodes, such symmetric supercapacitor in the 1 M KOH aqueous electrolyte exhibited high specific capacitance (227 F g-1 at 20 mV s-1), fast rate capability (83% capacitance of current density 1 mA cm-2 at current density 5 mA cm-2), low resistance (0.98 Ω), and excellent cycling stability (87% capacitance retention after 10,000 charge/discharge cycles). Moreover, the symmetric supercapacitor in the ionic liquid (BMIMTFSI) electrolyte possessed a wide operating voltage (3 V) and high energy density (89 Wh kg-1 at 1 mA cm-2). The carbon-based hybrid electrode has high potential for use in energy storage and conversion devices.
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Keywords: Carbon Nanotube; Graphene; Nitrogen-Doped Graphene; Supercapacitor

Document Type: Research Article

Affiliations: 1: Department of Electronic Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan 2: Department of Material Science and Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan 3: Department of Electrical Engineering, NationalChiaoTungUniversity, Hsinchu 300, Taiwan

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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